Hi Daniel,
Thank you for the answer.
Also I realized that somehow my email has split into two different threads,
sorry for the confusion.
Best,
Pawel
On Tue, Nov 15, 2022 at 9:48 AM Daniel P. Berrangé <berra...@redhat.com>
wrote:
> On Tue, Nov 15, 2022 at 12:19:35AM +0100, Pawel Polawski wrote:
> > Hi Everyone,
> >
> > I am trying to check qemu virtual cpu boundaries when running a custom
> > edk2 based firmware build. For that purpose I want to run qemu with more
> > than 1024 vCPU:
> > $QEMU
> > -accel kvm
> > -m 4G
> > -M q35,kernel-irqchip=on,smm=on
> > -smp cpus=1025,maxcpus=1025 -global mch.extended-tseg-mbytes=128
> > -drive if=pflash,format=raw,file=${CODE},readonly=on
> > -drive if=pflash,format=raw,file=${VARS}
> > -chardev stdio,id=fwlog
> > -device isa-debugcon,iobase=0x402,chardev=fwlog "$@"
> >
> > The result is as follows:
> > QEMU emulator version 7.0.50 (v7.0.0-1651-g9cc1bf1ebc-dirty)
> > Copyright (c) 2003-2022 Fabrice Bellard and the QEMU Project developers
> > qemu-system-x86_64: -accel kvm: warning: Number of SMP cpus requested
> > (1025) exceeds the recommended cpus supported by KVM (8)
> > Number of SMP cpus requested (1025) exceeds the maximum cpus supported by
> > KVM (1024)
> >
> > It is not clear to me if I am hitting qemu limitation or KVM limitation
> > here.
>
> As per the error message, this is a KVM limit. QEMU queries the KVM
> kernel module for this limit at runtime.
>
>
> With regards,
> Daniel
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--
Paweł Poławski
Red Hat <https://www.redhat.com/> Virtualization
ppola...@redhat.com
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